Scraper, scraper, scraper.

The Calaveras Dam Replacement Team has been working hard since April, scraping away at existing earthen materials to excavate for the dam foundation. We have now reached the highest point of the dam foundation for the future replacement dam. This point is located in the right abutment, an area located to the right when looking downstream from the dam. By July 2012, we anticipate to move close to 1 million cubic yards of materials. Our scrapers are excavating approximately 20,000 cubic yards per day. The scrapers operate with hydraulics using a blade which then scrapes materials into a drop can, carrying up to 30 cubic yards per trip. These materials are then moved to a disposal area within the project site. The scrapers are about 11 feet tall and the project is operating 12 scrapers for the excavation work.

For more project info, contact us at our 24 hour answer line at (866) 973-1476 or email mle@sfwater.org

View of Right Abutment Area

Scraper working in Right Abutment Photo courtesy of Robin Scheswohl

Join the New Irvington Tunnel Roadheader Challenge!

The New Irvington Tunnel Roadheader Challenge is stil underway. Don't miss out on an opportunity to make the winning selection!

Tunneling excavation continues east from Mission Boulevard with the use of controlled detonation at a rate of approximately 12 feet per day. A road header travels west from I-680 at a rate of approximately 15 feet per day. When will the two meet?

Your challenge is to figure out the day and time you think the tunneling workers will meet. Guess correctly and you could win a prize pack featuring gift certificates to local business and other goodies! The chart has squares corresponding to a date and timeframe in June or July, when the rendezvous could happen. Selections submitted by contestants are indicated by a star.

Information to Help You Choose

In June or July, miners excavating the new tunnel from the Irvington Portal in Fremont will meet miners tunneling west from the Vargas Shaft. When it happens this hole-through will mark the completion of the Irvington-Vargas tunnel segment.

The tunnel segment between Irvington Portal and Vargas Shaft is 4,500 feet long. As of May 12th, miners have tunneled 1,787 feet east from Irvington and 2,070 feet west from Vargas. Ground conditions dictate excavation. In ideal ground conditions, crews have tunneled up to 98 feet in a day. When ground conditions are poor they excavate less than 20 feet. Miners do not tunnel on Sundays.

How to Enter

1) Choose your top three squares and e-mail your choices to: fzamora@sfwater.org

2) Include the date and time you think the hole-through will take place. Squares will be assigned first come, first serve. Only one square is allowed per person

3) If the first choice is available then the square is assigned to that person. If the square is unavailable then the next available choice is assigned.

4) Submissions will be accepted until May 31. Please include your name, address, phone number and e-mail so we can contact you if you're successful!

Good luck!

Calaveras Dam Project Team Welcomes AMGEN

Road Closure Update

Calaveras Road will be OPEN to the public to accommodate the AMGEN Tour from 6:00 a.m. to 6:00 p.m. on Tuesday, May 15, 2012 between Geary Road to the Alameda/Santa Clara County boundary. The AMGEN Tour of California will begin Stage 3 of their race in San Jose and riders will cycle through Calaveras Road and Highway 84. Please expect an increase in traffic during this event.

After May 15th, the road closure will return to its regular schedule of April 9, 2012 to June 8, 2012, during which Calaveras Road will be CLOSED to vehicle, pedestrian, and bicycle traffic between Geary Road to the Alameda / Santa Clara County boundary on weekdays ONLY, open on weekends.

For more info on the AMGEN Tour of California visit: www.amgentourofcalifornia.com

For more project info, contact us at our 24 hour answer line at (866) 973-1476 or email mle@sfwater.org

New Irvington Tunnel Challenge Continues!

Tunneling excavation continues east from Mission Boulevard with the use of controlled detonation at a rate of approximately 12 feet per day. A road header travels west from I-680 at a rate of approximately 15 feet per day. When will the two meet?

Your challenge is to figure out the day and time you think the tunneling workers will meet. Guess correctly and you could win a prize pack featuring gift certificates to local business and other goodies! The chart has squares corresponding to a date and timeframe in June or July, when the rendezvous could happen. Selections submitted by contestants are indicated by a star.

Information to Help You Choose

In June or July, miners excavating the new tunnel from the Irvington Portal in Fremont will meet miners tunneling west from the Vargas Shaft. When it happens this hole-through will mark the completion of the Irvington-Vargas tunnel segment.

The tunnel segment between Irvington Portal and Vargas Shaft is 4,500 feet long. As of May 7th, miners have tunneled 1,747 feet east from Irvington and 1,955 feet west from Vargas. Ground conditions dictate excavation. In ideal ground conditions, crews have tunneled up to 98 feet in a day. When ground conditions are poor they excavate less than 20 feet. Miners do not tunnel on Sundays.

How to Enter

1) Choose your top three squares and e-mail your choices to: fzamora@sfwater.org

2) Include the date and time you think the hole-through will take place. Squares will be assigned first come, first serve. Only one square is allowed per person

3) If the first choice is available then the square is assigned to that person. If the square is unavailable then the next available choice is assigned.

4) Submissions will be accepted until May 31. Please include your name, address, phone number and e-mail so we can contact you if you're successful!

Good luck!

New Irvington Tunnel Challenge!

Tunneling excavation continues east from Mission Boulevard with the use of controlled detonation at a rate of approximately 12 feet per day. A road header travels west from I-680 at a rate of approximately 15 feet per day. When will the two meet?

Your challenge is to figure out the day and time you think the tunneling workers will meet. Guess correctly and you could win a prize pack featuring gift certificates to local business and other goodies! The chart has 101 squares each corresponding to a date and timeframe in June when the rendezvous could happen. Selections for this week are indicated by an “X”.

How to Enter

1) Choose your top three squares and e-mail your choices to: fzamora@sfwater.org

2) Include the date and time you think the hole-through will take place.

3) Squares will be assigned first come, first serve. Only one square is allowed per person

4) If the first choice is available then the square is assigned to that person. If the square is unavailable then the next available choice is assigned.

5) Submissions will be accepted until May 31. Please include your name, address, phone number and e-mail so we can contact you if you're successful!

Information to Help You Choose

In June, miners excavating the new tunnel from the Irvington Portal in Fremont will meet miners tunneling west from the Vargas Shaft. When it happens this hole-through will mark the completion of the Irvington-Vargas tunnel segment. The tunnel segment between Irvington Portal and Vargas Shaft is 4,500 feet long. As of April 28th, miners have tunneled 1,702 feet east from Irvington and 1,890 feet west from Vargas. Ground conditions dictate excavation. In ideal ground conditions, crews have tunneled up to 98 feet in a day. When ground conditions are poor they excavate less than 20 feet. Miners do not tunnel on Sundays. Good Luck!

Calaveras Dam Tunneling Away

Tunneling is a daily occurrence for other Water System Improvement Projects like our neighbors at the New Irvington Tunnel; as of today the Calaveras Dam Replacement project has reached approximately 65 feet in tunneling for one of our three adits for the Calaveras Dam.

The new intake shaft will be excavated vertically about 200 feet in total. Entering through our new intake shaft, our team utilizes a roadheader, a piece of excavating equipment used to break through bedrock by drilling horizontally. Today, our new adit has successfully reached the existing intake tower, which connects the Calaveras reservoir water supply to the rest of our water infrastructure system. The adits function as connecting tunnels between the reservoir water which is fed through the intake tower and is eventually treated to supply our drinking water. The three adits, located at different levels, are able to transport water at different reservoir levels. Work will begin on the second and third lower adits as the shaft excavation progresses. Our team continues to comply with all the required safety requirements, utilizing a ventilation system through the duration of the tunnel work. View of roadheader looking down into new intake tower:

For more project info, contact us at our 24 hour answer line at (866) 973-1476 or email mle@sfwater.org

Road Header Rendezvous Challenge

A road header travels east from Mission Boulevard at rate of 45 feet per day. A second road header travels west from I-680 at a rate of 35 feet per day. When will the two road headers meet?

At some point, we’ve all scratched our heads and tried to figure out a math problem like that. Here at the SFPUC we won’t ask you to solve word problems. Instead, we invite you to be part of our Road Header Rendezvous Challenge.

In June, miners excavating the new tunnel from the Irvington Portal in Fremont will meet miners tunneling west from the Vargas Shaft. When it happens this hole-through will mark the completion of the Irvington-Vargas tunnel segment.

The chart above has 101 squares each corresponding to a date and timeframe in June when the rendezvous could happen. Your challenge is to figure out the day and time combination. Guess correctly and you could win a prize pack featuring gift certificates to local business and other goodies.

How to Enter
Choose your top three squares and e-mail your choices to fzamora@sfwater.org. Include the date and time you think the hole-through will take place. Squares will be assigned first come, first serve. Only one square is allowed per person.

For example, someone could submit the following:

1. June 19 between 6:01 AM and 12:00 PM
2. June 5 between 6:01 PM and 12:00 AM 
3. June 28 between 12:01 AM and 6:00 AM 

If the first choice is available then the square is assigned to that person. If the square is unavailable then the next available choice is assigned.

Submissions will be accepted until May 31. Please include your name, address, phone number and e-mail so we can contact you if you're successful!

Information to Help You Choose
The tunnel segment between Irvington Portal and Vargas Shaft is 4,500 feet long. As of April 24, miners have tunneled 1,657 feet east from Irvington and 1,810 feet west from Vargas. Ground conditions dictate excavation. In ideal ground conditions, crews have tunneled up to 98 feet in a day. When ground conditions are poor they excavate less than 20 feet. In the last month miners averaged 38 feet per day. Miners do not tunnel on Sundays.

We’ll update the tunnel’s progress every week at www.sfwater.org/nit. Good luck!